A ring species is an organism that occurs in several varieties and is distributed in a geographical circle. This is because a species-specific has habitat requirements and the rest of the area is an obstacle to the further spread of the species. The ring is formed due to the lateral spread of a species, for example, along a coastline. During the expansion of the habitat of the species has changed little. When the ring closes, the species can be so developed that propagation between the two ends of the ring at the meeting point is no longer possible. When the population in part of the ring would disappear, there would be two separate species left, created by evolution.

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